Journeyman Electrician Practice Test-1
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Free online Journeymen electrician exam -1
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Question 1 of 20
1. Question
1 pointsFor stationary small motors rated less than ………………, the branch circuit over current device may serve as a controller.
Correct
Incorrect
Refer : Section 430.81 ( A)
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Question 2 of 20
2. Question
1 pointsA 440 volts motor has a full load current of 34 amperes. what size disconnecting means is required?
Correct
Incorrect
Refer: Section 440.12(A)(1)
The rating of disconnecting means is 115% of full load current.
34 * 1.15 = 39.1 amperes.
The nearer rating is 40 amperes. -
Question 3 of 20
3. Question
1 pointsIf the panel board rating is 100 amperes, what shall be the over current device rating located in panel board?
Correct
Incorrect
Refer NEC 408.36
The over current device rating must not be greater than panel board rating in which it is located
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Question 4 of 20
4. Question
1 pointsUnderground wiring shall be installed in which of the following conduit
Correct
Incorrect
Refer : NEC 515.8
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Question 5 of 20
5. Question
1 pointsWhat is the minimum size of THWN conductors required for single phase 10 HP motor connected to 240 volts supply?
Correct
Incorrect
Refer: NEC Table 430.248
FLI current of single phase 10 HP motor at 230 volts = 50 amperes
Refer: NEC 430.22
Minimum conductor ampacity = 50 * 125% = 62.5 amperes
Refer: NEC Table 310.15(B)(16)
6 AWG THWN Copper with 65 amperes capacity at 75 0C is suitable conductor for the motor
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Question 6 of 20
6. Question
1 pointsAll 15,20 amperes receptacle outlets installed in bathrooms of dwelling units shall always require …………………………………….
Correct
Incorrect
Refer : NEC 210.8 (A)(1)
A GFCI protector is required to install with all 15,20 amperes receptacles installed in bathrooms.
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Question 7 of 20
7. Question
1 pointsWhat is the minimum size secondary conductor required for a 2 wire 480 volts/ 120 volts transformer rated at 2.3 KVA with 750C temperature at terminals?
Correct
Incorrect
Secondary transformer current = 2300 / 120 = 19.16 amperes
Refer: NEC Table 310.15(B)(16)
The suitable conductor is 14 AWG with 20 amperes capacity at 750C
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Question 8 of 20
8. Question
1 pointsWhat is the low voltage contact limit for sinusoidal AC?
Correct
Correct
Ref: Section : 600Incorrect
Incorrect:
Ref Sec:600 -
Question 9 of 20
9. Question
1 pointsFlexible cards may not be used in the following locations ……….
Correct
Incorrect
Refer: Section 400.7 & 8
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Question 10 of 20
10. Question
1 pointsWhen branch circuits used at outside, the size of overhead conductors for 600 volts or less, for spans upto 50 feet, shall not be less than …………. copper.
Correct
Incorrect
Refer : Section : 225.6(A)(1)
For Copper it is NO.10
for aluminum it is NO 8 -
Question 11 of 20
11. Question
1 pointsThe following materials shall not be used as Grounding electrodes.
Correct
Incorrect
Refer: NEC section 250.52.(8)(B)
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Question 12 of 20
12. Question
1 pointsIn a metal wire-ways, the distance between supports shall not exceed ………….. ft.
Correct
Incorrect
Refer : NEC 376.30(A)
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Question 13 of 20
13. Question
1 pointsWhat is the resistance of the conductor if the conductor voltage drop is 3.6 volts and current flowing through conductor is 18 amperes?
Correct
Incorrect
Conductor voltage drop = 3.6 volts
I R = 3.6 volts
R = 3.6 / 18 = 0.2 ohms
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Question 14 of 20
14. Question
1 pointsWhen an electrical circuit tested with ohmmeter, a short circuit is indicated by a reading of ………………….
Correct
Incorrect
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Question 15 of 20
15. Question
1 pointsWhat is the resistance of 80 watt Light bulb rated at 120 volts?
Correct
Incorrect
Power = E2 / R
R = E2 / PR = (120 * 120) / 80
R = 180 ohms
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Question 16 of 20
16. Question
1 pointsIf two 4 ohm resistors are connected in series which are powered by 240 volts power source, what is the current flow across one 4 ohm resistor?
Correct
Incorrect
Total resistance of the circuit = 4 + 4 = 8 ohms
Current flow in the circuit = 240 /8 = 30 amperes
In series circuit flow in the circuit elements is same. so 30 amperes current will flow in both series resistors.
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Question 17 of 20
17. Question
1 pointsWhat is the demand factor applied in calculating feeder or service conductor load for a commercial kitchen having four electrical equipment
Correct
Incorrect
Refer : NEC 220.56
Demand factor for kitchen equipment in other than dwelling unit shall be applied according to 220.56 table.
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Question 18 of 20
18. Question
1 pointsWhen the single phase air conditioner rating is less than ………. at 240 volts can be considered as single motor unit in determining branch circuit conditions.
Correct
Incorrect
Refer: NEC 440.62 (A)
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Question 19 of 20
19. Question
1 pointsIf a 230 volts load is connected to 240 volts power source, what is the minimum voltage that can be supplied to load as recommended by NEC?
Correct
Incorrect
NEC recommends the maximum voltage drop should be less than 5% for both branch circuit and feeder.
5% drop = 240 * 0.05 = 12 volts
The minimum voltage that can be supplied to load is 240 – 12 = 228 volts
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Question 20 of 20
20. Question
1 pointsFor a 300 ampere electrical circuit, what is the minimum size copper equipment grounding conductor as per NEC?
Correct
Incorrect
Refer : NEC Table 250.122
4 AWG is the minimum size wire for a 300 ampere circuit
thanks
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